package com.yundin.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.yundin.constant.MessageConstant;
import com.yundin.constant.StatusConstant;
import com.yundin.dto.DishDTO;
import com.yundin.dto.DishPageQueryDTO;
import com.yundin.entity.Dish;
import com.yundin.entity.DishFlavor;
import com.yundin.entity.Setmeal;
import com.yundin.exception.DeletionNotAllowedException;
import com.yundin.mapper.DishFlavorMapper;
import com.yundin.mapper.DishMapper;
import com.yundin.mapper.SetmealDishMapper;
import com.yundin.mapper.SetmealMapper;
import com.yundin.result.PageResult;
import com.yundin.service.DishService;
import com.yundin.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 新增菜品和对应的口味
     *
     * @param dishDTO
     */
    @Override
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
         //向菜品表插入1条数据
        dishMapper.insert(dish);//后绪步骤实现
       //获取insert语句生成的主键值
        Long dishId = dish.getId();
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
         //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);//后绪步骤实现
        }
    }
    /**
     * 菜品分页查询
     *
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        if(dishPageQueryDTO.getName()!=null || dishPageQueryDTO.getCategoryId()!=null)
            dishPageQueryDTO.setPage(1);
        PageHelper.startPage(dishPageQueryDTO.getPage(),
                dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);//后绪步骤实现
        return new PageResult(page.getTotal(), page.getResult());
    }

    @Autowired
    private SetmealDishMapper setmealDishMapper;
    /**
     * 菜品批量删除
     *
     * @param ids
     */
    @Transactional//事务
    public void deleteBatch(List<Long> ids) {
//判断当前菜品是否能够删除---是否存在起售中的菜品？？
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);//后绪步骤实现
            if (dish.getStatus() == StatusConstant.ENABLE) {
               //当前菜品处于起售中，不能删除
                throw new
                        DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
              //判断当前菜品是否能够删除---是否被套餐关联了？？
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && setmealIds.size() > 0) {
            //当前菜品被套餐关联了，不能删除
            throw new
                    DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
          //删除菜品表中的菜品数据
        for (Long id : ids) {
            dishMapper.deleteById(id);//后绪步骤实现
          //删除菜品关联的口味数据
            dishFlavorMapper.deleteByDishId(id);//后绪步骤实现
        }
    }

    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
//根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);//后绪步骤实现
//将查询到的数据封装到VO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
//修改菜品表基本信息
        dishMapper.update(dish);
//删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
//重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
//向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }
    /**
     * 菜品起售停售
     *
     * @param status
     * @param id
     */
    @Transactional
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);
        if (status == StatusConstant.DISABLE) {
         // 如果是停售操作，还需要将包含当前菜品的套餐也停售
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
          // select setmeal_id from setmeal_dish where dish_id in (?,?,?)
            List<Long> setmealIds =
                    setmealDishMapper.getSetmealIdsByDishIds(dishIds);
            if (setmealIds != null && setmealIds.size() > 0) {
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);
                }
            }
        }
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }
/**
 * 条件查询菜品和口味
 * @param dish
 * @return
 */
public List<DishVO> listWithFlavor(Dish dish) {
    List<Dish> dishList = dishMapper.list(dish);
    List<DishVO> dishVOList = new ArrayList<>();
    for (Dish d : dishList) {
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(d,dishVO);
//根据菜品id查询对应的口味
        List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());
        dishVO.setFlavors(flavors);
        dishVOList.add(dishVO);
    }
    return dishVOList;
}
 }